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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10a153d495a22b3962cad7c60193de445af70245a32f7970f38b130096b6ef93' 
  AND token = 'lP2cBrElqE6Kyvx3HZV87+qEkcWImp7UXM1+nryNlbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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