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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96580a51c204459ad922f0980136f7c8bd1b78380f3f78341809a64e4eea0fb0' 
  AND token = '9TtpatA6s9ZFDT3DU186c/Ufyv+LcqGKxRiM8WwwnbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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