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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78158f2334eb882d9f81b1d75b3da7b9fc0008a9f604aafc20a5a0d71e1180e3' 
  AND token = '0cj9PzOI5KosmJTUvnXx49ZxvaqMbqjHC5QJFS1ecZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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