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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeadd6c34c0d0e8ebd4958e2bc1abdbd46caa1d7ebb46ca157c7b768826f13aa' 
  AND token = 'OceIN4mE4fmmCD9rZkCq4vyeTJ2FTG7ZEAURJDeSn2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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