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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7ba73d6710bfa344249adebd532df9257ffaff63dbf9fd60c51787edce4a40' 
  AND token = 'a2fF4ovPLFS7c6ue/uhLDzen2b5pScw9LVM/GrlIq14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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