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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b32ad0fe55e2abaa6711bf9720658bf6950b46f0ddfbc15d3b30bf2d86d94de7' 
  AND token = 'Dq7CXDPjlbpL+ECEPD29aZEdzLTRK/d3MDDh1Kep9yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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