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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1611ccadd516e10f8ed30094e0b919b1e215b86417a35a65904aaee57e9d3383' 
  AND token = 'b3NjrOJnHsw9L3jXI1XtKRt0m3FU79qZazPNm5VsPS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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