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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2dfb0db9e15973ecc413bc7acd36b989be00b1eb388456055f062e903439da8' 
  AND token = 'pEnCs8U9uvK5rGF+HWTAfqvOiN1S5thi5HI69tsV/Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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