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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0bda4d5667d5e046ecd2950099d569c1e8cda55031b481b60e85d4e31dad20' 
  AND token = 'RCdFZYEtj4TkV6hmy5EVU4iJOyC7tnv7lNoXeK/X690=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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