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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a935f5e0fd35933896385551fef4c5f75b278939c9e15c614e9c3c31fb9193e' 
  AND token = 'BRV+8Xs6lgYQcu6dDSylcSQcseDvZBIjW6vJIa/HbWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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