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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2fdc7c884e20267a1b390f3330de3b2571e596a0832cfc37df230ab91c0e9d' 
  AND token = 'yMfIJNTwWHZdZEb5Hxy97wIb/weDuENH6FxNu9IPvaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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