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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2d3acfecaf39368f5e21418e350f9b1d4b8a096a27c13fe1363811dfce4f71' 
  AND token = 'xkgxwI+zG3yrWeObROYtGJtD+qc9zRT3sIazcskMiEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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