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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6b0a5bca43df1ffa5e014643efee9593c8763be8ec0c093db5f97d372a2401' 
  AND token = 'OAPzy5kGPJm4O3Qa8Qmpjn2JmWJrBSTb6u77YTdjEDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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