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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347d3efe9a47d2505fe2915f7eef9acea1afae3f4e116d14688fbcf91b1420bf' 
  AND token = 'dwlU3BPx+SrzikNEk7fDqnleN44P5UHF/XVrPa9xSz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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