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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86ff759d895611fdf2b134294c691a7dd8ce0b35871e5ef00dbbc505af42962' 
  AND token = '9iUbHqSMY8Tlqc4bXN/Y8KStWK/yw6Xiv0OD2HZPp2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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