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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4930d01a2afaf7dfaef6b9d0aafec218aea3f2d184853d32c6b9efe4bbbca4a' 
  AND token = '6PsQq2RxootaldltPeaBKTdrTiL7vyb/Zz4b2yRV1oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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