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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca80af0cbfdc8e1982586964ecb535922cbfa7597305ba4db51b7e6353fe09c9' 
  AND token = 'FPRue5p1iF+R1i8nt2UxiQyW72jCDPbVz4Dsrh++sBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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