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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be462593b7fd81ffafd5b5e81c85cbde2155418a5d7fe1fe5d5fdcfa1e43349f' 
  AND token = 'SZiuSIRrsu5HELNgUSwT0/159Ookb8Fnis2TjcPBtg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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