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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb411357c23a06d4ab9136c0ae3fccd64ef1996ed369de5d6b47e0aae41f7b67' 
  AND token = 'zt5S4FRrjqgO8z3miX/IsnunZDQs5aodzJfR7CcK9RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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