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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5a3fa574b0378608a8d6e28572f08a1e6ba4cdb9ac986ee00ea7955a0a3fe7' 
  AND token = 'IBGj8cxYnmhxFkXTL+1ezxV4XD6950ronXai20zVoWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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