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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b36b17ca3c0a46e7e3fcbdab008af37e61eade28d0fad7b9bfa3120e8543d8c7' 
  AND token = 'QPRx15rk7BUkbyeWgJ2L/6Q7wJxCQKLvDwV6USRPdwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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