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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9cec08b37015d6e001b486ac3dbae9497d65650b293a1cbaf1e5bea81703504' 
  AND token = '5DRZZhV6Mt0+5K2wdqzWGY7i5QKQwTfILIdnE3CvO0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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