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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ce1af10af6de45ff41c0427a6d15981c7ddb703314fe71f22fdd24bf710a41' 
  AND token = 'YQD20B+PRcTHDCm3Kg6mfRn7WaLftX3njzwdf+gTrgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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