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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addbd5841eb5d2f5b4b0e20ccc432c6fd065e59f90571d3328965e1aa4eb892d' 
  AND token = 'HEZX3alZHzNA2/iHhK4YrDLIR59Vn910SbYHlRiu5Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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