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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '654dd9e4168ff29c0fca890e5f4f370456810f02a2415ca94f4d112aeff085e4' 
  AND token = 'yfjt69ybr8GMz3I7QLrhH2ZQibWjzLRJOkjcvpuFUks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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