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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616a327e70440ca34abf66bcecca9d0fa794f1dd8f5a418cd4655ea81a806998' 
  AND token = '7ls1iEg4l9SelZNdyY4js3kCC2vWUeza32HnvPY0x20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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