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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d6e1132a278207e419edb8d1968bc59c45f31dfbeae555854b31ba1ac069b3' 
  AND token = 'ayQ111UDY1Hu0Ae6pt5NgNYINgtADIj9DkGE0wDyUMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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