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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5b3ac312720409e42d50fe40d95d1d69424a4f8343f4e2ceb59ef5ba939051' 
  AND token = '8pGWYGUJpzQPHzrN4KOkC362TWvMeo9SH9P2nddqlaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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