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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d1872df40ac573a76fb4d1042d587f0a67ae28a20c25701f278d7495ce2d24' 
  AND token = 'Gp3orSTL9vlAW2roC0a/EPztY64GYmx+tWVGqzChgro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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