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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd789d0dcca5b0bd42dac96d9986fa29500c10c10cd1eb32ac924a4a3376a8b04' 
  AND token = 'TGDhR/El2DuWBxxTyazUrDX03hXD+dcoXIsvaNnw+CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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