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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a07c8c57d1339b36276f0125072e3b2c166d4b672fc09d0fc987c149a7f33a' 
  AND token = 'QAnQzfZuMAHOuEbf7jLnxQgdP66dt4HTiJ6ZtGtSuX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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