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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d3c1f2cec5d695d028b15fbf7221538f9318cb9a0040903246c33d8d4e8968' 
  AND token = 'kwRJFudcfs/T54F0cVvkaAyN1uIhcq0SBhATMACMv6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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