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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d2c18c9a5a6f506661018cd9d67057a34db61e31f8e3a97173e7e8c6e240185' 
  AND token = 'WJYzF0t0vGMLKr4NQipG7jVv/pz2YvBHz2tVExTe8nE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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