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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfb0f7f46c31eecf6c17d3e41d463e0d51ef19e7421aecd0e7c360848d84ca6' 
  AND token = 'TOSCdqYwWAbhgqTok0t//GDPEPUUCUo3NPOjZhwcn3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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