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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c96301f9ff72c35325d76541e32665f43f094969bc2584f191ec59b51ac9c3a' 
  AND token = 'L7gdyVrhG4niepjm2SUGA55Bd6eP/xzi3YrFrktt0zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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