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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4fb5324bec66c6eba143f8b299b8bb6a3035a003d5c88fb9d542828139c7bb' 
  AND token = 'HZe2Kzpk7SQAv+bXre2s2pofqYPO7OtBS350ktV++ZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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