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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77c0b94d42b229f9519d8d05ad9f57b7df0b7dfa3f37d67f57d8b0c03b4ecade' 
  AND token = 'xvzNkpDmxMNDM8x8xxE3u3M+AhiGielScopHwTBydoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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