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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6654ef75a1a25676a53281450264c91672dd2986c05425bc602cefc644e234e9' 
  AND token = '87pN6t7iUAZgzBc/cC8gfl98zsDBJ7idye0bmI+i0XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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