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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5194d3c74d7a625767345c1c3e31fef9f7392a92670809938e6bd79bf78aa37a' 
  AND token = 'VowHlMZDs6WbL+HatkfEFDHmCQ2dQRv07Xr3b8ieywM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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