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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a850b5df834007ddf4c2095c9c17e067cc5584ddf27ecc5b1290390e1ffb7fe8' 
  AND token = '0Wtpk2NCjYditfRhr/kWqk5ubzexIqWJzt5nVmOfL5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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