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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dec4c4275902249fe3b1a5541fb51a65e0c87026380f47fb33738e3f44b66ea' 
  AND token = 'K1505RsfCTyCRkXkqh6zEQoxhiUrTgzGq/jk8SjpHzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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