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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2b2c0da9683b07bbf56268d92591ccd6433e30c29dd9bdde6b6c00039aaafa' 
  AND token = 'ex9pwypN5XHYWF1tRFQ7sfK2bZQyZ/bdoBjpD/f4fCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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