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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52fbbb0309d71141d49f3c5e298605af05329715b920dcfe9257e60c1912fe38' 
  AND token = 'QqtSTtWs+T6MgM85bEkgpQZzukSx1kHzaoHSq5H17h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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