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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eea8cf8c6753bdf1799074e48aa9a69f4cf6c1bdc634f230a0655b69cb0fffae' 
  AND token = 'X99ehF3n1zFcyg8u5iFerHPHDVDsHXr1EYe7tc8t81Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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