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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6b302b8d1ff0b730138bbb44eaefac7247ae3ace61e464caea69db5b8c3db6' 
  AND token = 'IGE2873/NX/HAnLQfg5gsRVXu0E2rD5vAGiYOscWDpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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