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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70ea5ea5e01e910ac97e5a56403bbd39911ecfd4c9e53c2d877a0b47383a038' 
  AND token = 'lI+1ynagOjfBPqS4FYgD4ifUpd7LyecDb5NgM9uWOzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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