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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '797d8eb7bdf0f862020e5cf5de8086bcbc9702474b8e979397c77ff5329f989b' 
  AND token = 'u5uoxA9apDy7v2AolSL/Zd4IP9abJFYjQe6mjubUwPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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