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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad25553516e53b4361aaa274cde0dd44ff7916ff26bf73f9606e4e52102dcb2' 
  AND token = '+uqNtRBFDHi34dOIkZDotUN3naeqaZuZDIIMfPvp/Ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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