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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925baaf3b8c47aaab03a30ae5728bc2aeb208aac7376ea93f33dff4c8a349c2d' 
  AND token = 'jotEyaHXsm8drCfO/LfnTT1j5iav/wEUepsMlrau2r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}