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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1db465702b3b0576884df27dbb144ba84ab74fa457e60e34f8677f56dc9e15' 
  AND token = 'd23qPx/vzbhZUGKr1ZuGBpOrMetn1unou0bNX88d8eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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