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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd425c9d5dcf658422e089b21e157e432902ed8afedc774088f6b26e2b4ff03' 
  AND token = '+xORRi/wKXZyARah3Ypk6kAiEShOyhcHOZX+0Gz+7+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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