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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3cd188f9fb36fc686bc9dc5ceee81b9dc54ef3b95923ef911f0b99c2739d5e' 
  AND token = 'zpDLmnNmsbfWioDHMVbWWROxHDLPdaCMluZxNtNHkVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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