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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2253cdb1eaef031b841a2b6116d5b4f8d8e052948e5543dff75c5b07078d7593' 
  AND token = '55/hXAZa6WrstvYIhgUMYfx44/AuufpKL2/wAOTf2vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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