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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8f85eb3f9fccd5a5e887adc05c760c477e99e761b744e8a6557d0e5a2d11a6' 
  AND token = 'wLOJtD7G056qr9kWDzkDB2g2fJyfC2qswqqibax3D/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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