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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98c424c3d5a5e116a661c72bfc7a2da82e912398a1b259ee5d9851635e970b4' 
  AND token = '2cjpDPCmguhnrJu9xn7vwtfWuvGvBgG84t8r8Hd/tAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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