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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1935ed63527dacd47fe9248687e376176eeef546b92d749214cfce8bf0ed7138' 
  AND token = 'la/l5hy+OhSQlEN2LkYq6pRKoSok7f8yw/6MUDTPZtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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