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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288b1ae8f87d293f9183b69f61009de62e197b3bb852e32e39a49e1d775b0119' 
  AND token = 'J3VmCsMDrIRne995ei/VyYZ/q0/rcCRtCTpdC1aIW6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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