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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2197b5c7ce1f9979e62c2fc25203cc9f156ca15ace787ef4f5e3132545adfa59' 
  AND token = '/i+EZWbNjyHmI6r1m8myfvcK+4SazAPQbQE6dNKNllw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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