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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '598eb2b7ea62953d2590e49f535a75b0022e854b848f38bbe3800d1f5c0826ac' 
  AND token = 'iv/3X4vy/r437UcIj74PgDOZ+SiQ+jRIfOFATRLTCNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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